diff --git a/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeExtensionGuesser.php b/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeExtensionGuesser.php
index 75eeefbf5d..17fd344b84 100644
--- a/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeExtensionGuesser.php
+++ b/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeExtensionGuesser.php
@@ -661,6 +661,7 @@ class MimeTypeExtensionGuesser implements ExtensionGuesserInterface
         'image/gif' => 'gif',
         'image/ief' => 'ief',
         'image/jpeg' => 'jpeg',
+        'image/pjpeg' => 'jpeg',
         'image/ktx' => 'ktx',
         'image/png' => 'png',
         'image/prs.btif' => 'btif',